Harmonic suppression of symmetrical split ring resonator using double spurlines

In this paper, a new structure of planar microwave sensor for determining and characterizing dielectric materials in common solids is proposed as the appropriate technique to produce high Q-factor with harmonic suppression using double spurlines filter. The proposed sensor is based on new metamaterial symmetrical split ring resonator (SSRR) structure by employing spurline filter for circuit size miniaturization and harmonic suppression. The spurline filter structure forces the proposed resonator to resonate at the fundamental mode which is 2.2 GHz. The double spurlines provide a wider rejection bandwidth compared to the single spurline. The simulated results of the transmission coefficient are in a good agreement with the calculations. It is evidently demonstrated that the proposed ring resonator with double spurlines filter can effectively suppress the harmonic in the ring resonator. The proposed design with harmonic suppression is useful for various applications such as food industry, bio-sensing, medicine, pharmacy and quality control.